Added theme, reworked UI

lib/pages/common/titled_container.dart

@@ -0,0 +1,57 @@
+import 'package:flutter/material.dart';
+
+class TitledContainer extends StatelessWidget {
+  final String title;
+  final Widget child;
+
+  const TitledContainer({super.key, required this.title, required this.child});
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      decoration: BoxDecoration(
+        color: Theme.of(context).colorScheme.primaryContainer,
+        borderRadius: BorderRadius.circular(15),
+        boxShadow: [
+          BoxShadow(
+            color: Theme.of(context).colorScheme.shadow,
+            blurRadius: 10,
+            offset: const Offset(2, 2),
+            spreadRadius: 0.1,
+            blurStyle: BlurStyle.normal,
+          )
+        ]
+      ),
+      margin: const EdgeInsets.symmetric(vertical: 10, horizontal: 0),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              Container(
+                decoration: BoxDecoration(
+                  color: Theme.of(context).colorScheme.secondaryContainer,
+                  borderRadius: const BorderRadius.only(topLeft: Radius.circular(15), topRight: Radius.circular(15)),
+                ),
+                padding: const EdgeInsets.symmetric(vertical: 5, horizontal: 15),
+                child: Text(
+                  title,
+                  style: const TextStyle(
+                    fontWeight: FontWeight.w300,
+                    fontSize: 20,
+                  ),
+                ),
+              ),
+            ],
+          ),
+          Padding(
+            padding: const EdgeInsets.symmetric(vertical: 10, horizontal: 15),
+            child: child,
+          ),
+        ],
+      ) 
+    );
+  }
+}